add scaffolding support to pub

[polux]

It would be nice for those not using the editor if pub had some command along the lines of

  pub init <project_type> <project_name>

that would create a pubspec.yaml file, lib/bin/web/test/... directories and maybe a lib in lib or a page and a lib in main. It could also ask for the project author's name, the license (and have a built-in set of licenses), etc.

[sethladd]

This would be cool!

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Added Triaged label.

[munificent]

Added Duplicate label.
Marked as being merged into #2432.

[DartBot]

This issue has been moved to dart-lang/pub#338.